shiels



,(No Model.) A s sheets-sheet 1 y i .A. S]E{IEJ.S.4 AUTOMATIG GOVERNOR FOR RRFRIGERATING RLANTS.

(No Model.) 3 Sheets-Sheet 2.

A. SHIELS. -AUTGMATIG GOVERNOR FOR RBFRIGERATING PLANTS.

Patented Jan. 14, 1896.

(No Model.) P,v sheets-sheet s,

A. SHELS,

M"(1![AI'I(` GOVERNOR POR-REPBIGERATING PLANTS. No. 553,077. Patented Jan. 14,1896.

i fave@ m mm1 UNITED STATES PATENT EErcE.

ALEXANDER SHIELS, OF GLASGOW?, SC-OTLAND.

AUTOMATIC GOVERNOR FOR REFRIGERATING PLANTS.

SPECIFICATION forming part of Letters Patent No. 553,077, dated January 14, 1896.

Application iiled June 11, 1894. Serial No. 514,219. (No model.) Patentedin England February 11, 1893,1lo.3,05'7

To ,Z whom, 25 may concern:

Be it known that I, ALEXANDER SninLs, a subject of the Queen of Great Britain, and a resident of the city of Glasgow, Scotland, have invented certain new and useful `Improvements in Automatic Governors for Refrigerating Plants, (for which l have received British Letters .Patent No. 3,057, dated Februar7 11, 1823,) ci' which the following is a speciiication.

rlhis invention relates to automatic governors for refrigerating plants, and it has for its object to improve their construction.

The intention-refers to that class of thermostats wherein the expansion and contraction of mercury, spirit, salt and water, or other iiuid sensitive to changes in temperature, is made to operate the apparatus.

The invention is speciallydesigncd for use with refrigeratirig-chambers, although it may be used for other purposes.

illy invention includes a special arrangement of safety-diaphragm with its chamber and a special form of regulating-diaphragm.

In order that my said invention may be properly understood I have hereunto appended explanatory sheets of drawings, whereon- Figure 1 is a longitudinal section of the thermostat. Fig. 2 is a plan. Fig. il is a sectional perspective view or' a compartment with my invention in place.

The manner of connecting up the system of circulating-pipes is shown in United States Patent No. 478, Z373, granted to me July 5, 1392, and it will not be necessary to illustrate the arrangement herein.

Referring to the drawings, whereon the same reference-numerals wherever repeated indicate the same or similar parts, 1 is the regnlatingdiaphragm, 2 the safety-diaphragm, and the storage-vessel.

As will be seen at Figs. 1 and 2, the whole apparatus may be fitted on a bed-plate or foundation el, the regulating-diaphragm being at one end, the storage-vessel at the other, andthe safety-diaphragm in the center.

The storage-vessel consists of a cylindrical chamber 5, which, at its lower end, is screwed into the dished bottoni plate 6 and at its upper end into the convex cover-plate 7.- The vessel is surrounded by a cylindrical protecting and insulating casing S. Fitted into the cover of the vessel is a branched casting D, which is bored with a vertical channel 10 and a horizontal channel 11. Coupled to the casting by the cap and plug-coupling 12 is a pipe 13 leading from the sensitive-luid-tube system fitted in the interior of the refrigerating-chamber, as shown at 70, Fig. S. This pipe communicates, as shown, with. the horizontal channel 11.

1l is a screwed spindle-valve, which, when screwed down, as shown, closes the upper end of the vertical channel 10.

15 is a vertical channel bored inthe upper end of the casting and leading from the channel 10 to the atmosphere.

The bottom plate G is made7 as shown, with a downward]y-projecting branch 1S, which is coupled to the branch 19 of the pipe 17. The branch 1S is bored with a central channel 16. The pipe l has also branches 20 and 2l which are coupled, respectively, to the downwardlyprojecting branches 22 and 23 of the safety and regulating diaphragm chambers.

The safety-diaphragm chamber consists of a concave bottom-plate 2i and a convex coverplate 25, which are secured to one another and to the foundation i by means of the bolts 20. The safety-diaphragm 2, which may be made of either rubber or metal, is covered by a leather or other protecting diaphragm 2. Both diaphragme are tightly secured between the flanges of the bottom and cover plates of the chamber.

27 is a small hole in the cover-plate 25. Mounted on the top of the cover-plate is a cylinder' 23, which has screwed on its upper end a domed cover 29. The lower end of the cylinder is screwed into a circular recess 30, cut out of or formed in the cover-plate. The cover 29 has an internally-screwed socket 3l cast on its upper end, and into this socket a knee-shaped casting 32 is screwed. The cha-nnel which is bored through this casting communicates with the hole 3a in the cover 2Q.

is a screwed spindle-valve iitted in the casting and by means of which the channel 33 can be closed. is a pressure-gage which is fitted on the hollow branch 37 communieating with the opening 3S 'in the cylinder 25.

The regulatingdiaphragm chamber consists of a slightly-conceived bottom-plate -10 and a recessed cover-'plate el., The main diaphragm 42 is protected by leather or other protecting diaphragms 43 44, and by a helieally-coiled spring 45, which is interposed between the diaphragms 42 43 and adds elasticity to the same. The spindle 46 has a piston or plunger 47 at its lower end which bears against the back of the diaphragms. This piston or plunger works in the recessed part of the cover-plate 4l. A tapered collar 48 is fitted on the spindle and around this collar a powerful spiral spring 49 is fitted. This spring at its upper end bears against the plate 50, which is supported on the pillars 5l.

52 is a downwardly projecting guide, around which the spring 49 is fitted, cast on the plate 50.

The upper end of the spindle 46 passes through a hushed opening 53 in the plate 50 and is connected, as shown, to the short arm 54 on the horizontal shaft 55. This shaft, which is carried in bearings 56, has at its end a long arm 57, which is so connected by levers or other well-known and suitable mechanism to the spindle of the Valve Y, Fig. 3, for controlling the supply of refrigerating-iuid to the chamber as to automatically operate it.

The branch l5 of the casing 9 is for iilling salt and water or other duid into the Vessel 5, and compressed air or gas is forced into the chamber 28 through the channel 33 in the casing 32.

The sensitive-fluid pipes are, by preference, as shown at Fig. 3, nested or grouped together in boxes 80, which are, preferably, arranged zigzag-wise around the interior of the refrigerating-chamber.

The apparatusis so arranged that any slight increase of temperature in the refrigeratingchamber above a certain iiXed limit is sufiicient to force up the regulating-diaphragm against the action of the spring and open or partially open the refrigerating-fluid or motive-Huid Valve, as the case may be, so as to increase the supply of cold to the refrigerating-chamber and again reduce its temperature to the normal. Likewise, if the temperature in the chamber falls slightly below the proper limit, the action of the spring is sufficient to force down the spindle 46 and close or partially close the supply-valve, so as to stop or reduce the supply of cold and allow the temperature to again rise to the normal.

It :is to be understood that Ido not confine myself to the exact details of construction shown on the drawings, as parts may be modiiied or altered without departing from the in- Vention.

Having now fully described my invention.

what I claim, and desire to secure by Letters Patent, is-

l. ln combination in a regulating apparatus, a regulating device, a conduit and a safety device, comprising a diaphragm chamber, a diaphragm therein, a chamber for compressed air surmounting the diaphragm chamber, the upper part of the diaphragm chamber being dome shaped to form a support for the diaphragm and perforated to form a passage way between the two chambers.

2. In combination in a regulating apparatus, the pipe system and a diaphragm composed of two flexible sheets of material with a spring 45 between them, substantially as described.

3. A safety device comprising in combination, a diaphragm chamber, a diaphragm therein, a chamber for compressed air surmounting the diaphragm chamber, the upper part of th'e diaphragm chamber being dome shaped. to form a support for the diaphragm and perforated to form a passage way between the two chambers, substantially as described. f

4. In combination in a regulating apparatus, a storage tank and a regulating device `connected together by a conduit with a safety device comprising a diaphragm chamber, a diaphragm therein, a chamber for compressed air surmounting the diaphragm chamber, the upper part of the diaphragm chamber being dome shaped to form a support for the diaphragm and perforated to form a passage way between the two chambers, substantially as described.

Signed at Glasgow, Scotland, this .0th day of January, A. D. 1894.

ALEXANDER SHIELS. llfitnesses:

H. D. FITZPATRICK, WILLIAM GALL. 

